Safety Blitz

What is Safety Blitz?

A defensive tactic in which one of the safeties will rush the
passer with the intent of forcing a bad pass or getting a sack. A
safety blitz can happen immediately after the snap, or it can be a
delayed blitz that takes place after a few seconds. The goal of the
safety is to find a hole in the offensive line and get to the
quarterback. A safety blitz is considered a high-risk, high-reward
play because blitzing a safety leaves less people in pass coverage,
and if the blitz is not successful, the quarterback has a greater
chance of a big completion.

Sporting Charts explains Safety Blitz

Teams will use a safety blitz to try and get more pressure on
the quarterback and force a bad play. Safety blitzes often are used
when the standard pass rush has been ineffective, or when the
defense is trying to create a big play for its team. The safety
will creep up to the line of scrimmage prior to the snap and
attempt to find a hole in the offensive line to break through and
sack the quarterback. The risk of a safety blitz is that it
eliminates one of the players back in pass coverage, giving the
quarterback a better chance to find an open receiver and complete a
pass.